Brake device for vehicles

Abstract

A brake device provided with an antilock controller which includes a sensor for sensing by the overrunning of a flywheel an abrupt deceleration of a wheel of the vehicle resulting from the braking action of a brake device, a modulator for controlling a braking pressure fed to the brake device in accordance with a signal from the sensor and a hydraulic pump driven by the wheel. The sensor and a transmission device are adapted to operatively connect the flywheel of the sensor to the wheel are housed in a closed chamber defined between a pair of hub end walls which are supported on an axle through bearings, and the flywheel is supported on the axle. The hydraulic pump, the modulator and a transmission device operatively connecting the hydraulic pump to the wheel are arranged externally of the closed chamber.

What is claimed is: 
     
       1. A brake device for a vehicle provided with an antilock controller which comprises a sensor having a flywheel driven by a wheel through a transmission system, said sensor sensing a state of the wheel being about to lock by an overrunning rotation of the flywheel, during braking by a wheel brake, to generate an output signal; a hydraulic pressure pump driven by the wheel through the transmission system; a modulator having a hydraulic control chamber in communication with an outlet chamber of the pump and interposed in a brake oil passage between a master cylinder and the wheel brake to decrease and restore a braking hydraulic pressure of the wheel brake in response to a decrease and increase in pressure of the hydraulic control chamber; and a normally closed exhaust pressure valve interposed in a communicating passage beteen the hydraulic control chamber and an oil reservoir, the valve being opened upon receipt of an output signal from the sensor, wherein a hub of the wheel is formed with a pair of left and right end walls to define a closed chamber therebetween, both said end walls being supported through bearings on an axle which extends through the end walls, at least said sensor and a first transmission device of the transmission system which is adapted to operatively connect the flywheel of the sensor to said hub are housed in said closed chamber, and the flywheel is supported on said axle, said first transmission device having a ring gear secured to one of said pair of end walls, the transmission system having another ring gear secured to the other end wall which drives said hydraulic pump. 
     
     
       2. The brake device according to claim 1 wherein said first transmission device comprises a ring gear formed integral with one of said end walls, a planetary gear secured to said axle and meshed with said ring gear, and a sun gear rotatably supported on said axle and meshed with said planetary gear. 
     
     
       3. The brake device according to claim 1 wherein said hub has a cylindrical shell portion, one of said pair of end walls is connected integral with said shell portion whereas the other is detachably secured to the shell portion. 
     
     
       4. The brake device according to claim 1 wherein said exhaust pressure valve is arranged externally of said closed chamber, a push rod is axially slidably fitted in said axle, the flywheel of said sensor is operatively connected to an axial inner end of said push rod, and said exhaust pressure valve is operatively connected to an axial outer end of said push rod. 
     
     
       5. A brake device for a vehicle provided with an antilock controler which comprises a sensor having a flywheel driven by a wheel through a transmission system, said sensor sensing a state of the wheel being about to lock by an overrunning rotation of the flywheel, during braking by a wheel brake, to generate an output signal; a hydraulic presure pump driven by the wheel through the transmission system; a modulator having a hydraulic control chamber in communication with an outlet chamber of the pump and interposed in a brake oil passage between a master cylinder and the wheel brake to decrease and restore a braking hydraulic pressure of the wheel brake in response to a decrease and increase in pressure of the hydraulic control chamber; and a normally closed exhaust pressure valve interposed in a communicating passage between the hydraulic control chamber and an oil reservoir, said valve being opened upon receipt of an output signal from the sensor, wherein a hub of the wheel is formed with a pair of left and right end walls which are supported through bearings on a stationary axle which extends thorugh the end walls, the end walls and a body of the hub and said axle cooperating to define a closed chamber therebetween, said antilock controller is divided into a mechanical operating section including the sensor and a first transmission device of the transmission system which is adapted to operatively connect the flywheel of said sensor to the wheel and a hydraulically operating section including a hydraulic pump, a second transmission device of the transmission system which is adapted to operatively connect the pump to the wheel, the modulator and the exhaust pressure valve, and wherein said mechanical opearating section is encased in said closed chamber with the flywheel being supported on said axle, while said hydraulically operating section is mounted on a supporting system for the wheel externally of the closed chamber. 
     
     
       6. The brake device according to claim 5 wherin said hub includes a cylindrical shell shape, one of said pair of end walls is connected integral with said shell shape whereas the other is detachably secured to the shell shape. 
     
     
       7. The brake device according to claim 5 wherein said mechanical operating section is arranged on said axle in an approximately axially central portion thereof, and the flywheel in said mechanical operating section and the exhaust pressure valve in said hydraulically operating section are operatively connected with each other through a push rod axially slidably fitted in said axle. 
     
     
       8. A brake device for a vehicle provided with an antilock controller which comprises a sensor having a flywheel driven by a wheel through a transmission system, said sensor sensing a state of the wheel being about to lock by an overrunning rotation of the flywheel, during braking by a wheel brake, to generate an output signal; a hydraulic pressure pump driven by the wheel through the transmission system; a modulator having a hydraulic control chamber in communication with an outlet chamber of the pump and interposesd in a brake oil passage between a master cylinder and the wheel brake to decrease and restore a braking hydraulic presure of the wheel brake in response to a decrease and increase in pressure of the hydraulic control chamber; and a normally closed exhaust pressure valve interposed in a communicating passage between the hydraulic control chamber and an oil reservoir, said valve being opened upon receipt of an output signal from the sensor, wherein a hub of the wheel is formed with a pair of left and right end walls to define a closed chamber therebetween, both said end walls being supported through bearings on an axle which extends through the end walls, said antilock controller is divided into a mechanical operating section including the sensor and a first transmission device of the transmission system which is adapted to operatively connect the flywheel of said sensor to the wheel and a hydraulically operating section including a hydraulic pump, a second transmission device of the transmission system which is adapted to operatively connect the pump to the wheel, the modulator and the exhaust pressure valve, wherein said mechanical operating section is encased in said closed chamber with the flywheel being supported on said axle, while said hydraulically operating section is mounted on a supporting system for the wheel externally of the closed chamber, and wherein said first transmission device receives a rotational force of said wheel from one of said pair of end walls, and said second transmission device receives a rotational force of said wheel from the other end wall. 
     
     
       9. A brake device for a vehicle provided with an antilock controller which comprises a sensor having a flywheel driven by a wheel through a transmission system, said sensor sensing a state of the wheel being about to lock by an overrunning rotation of the flywheel, during braking by a wheel brake, to generate an output signal; a hydraulic pressure pump driven by the wheel through the transmission system; a modulator having a hydraulic control chamber in communication with an outlet chamber of the pump and interposed in a brake oil passage between a master cylinder and the wheel brake to decrease and restore a braking hydraulic pressure of the wheel brake in response to a decrease and increase in pressure of the hydraulic control chamber; and a normally closed exhaust pressure valve interposed in a communicating passage betweeen the hydraulic control chamber and an oil rservoir, said valve being opened upon receipt of an output signal from the sensor, wherein a hub of the wheel is formed with a pair of left and right end walls to define a closed chamber therebetween, both said end walls being supported through bearings on an axle which extends through the end walls, said antilock controller is divided into a mechanical operating section including the sensor and a first transmission device of the transmission system which is adapted to operatively connect the flywheel of said sensor to the wheel and a hydraulically operating section including a hydraulic pump, a second transmission device of the transmission system which is adapted to operatively connect the pump to the wheel, the modulator and the exhaust pressure valve, wherein said mechanical operating section is encased in said closed chamber with the flywheel being supported on said axle, while said hydraulically operating section is mounted on a supporting system for the wheel externally of the closed chamber, and wherein said first transmission device comprises a ring gear secured to one of said end walls, a planetray gear secured to said axle and meshed with said ring gear, and a sun gear rotatably provided on said axle and meshed with said planetary gear, and whereas said second transmission device comprises a ring gear secured to the other end wall and a pinion secured to a pump shaft of said hydraulic pump and meshed with the ring gear on the other end wall.